Windows Phone notes (10) Use standalone storage (medium)

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• 1. Use the isolatedstoragefile class to store files and folders

Learn how to useIsolatedstoragesettings class to save the applicationProgramYou can also useUseIsolatedstoragefileClass storage files and folders. In this note, let's take a look at and learn how to use the isolatedstoragefile class to store files and folders.

1. Use the isolatedstoragefile class to store files and folders

Because I/O operations are involved, we first need to referenceSystem. IoAnd the isolatedstoragefile classSystem. Io. isolatedstorageThe two namespaces. The following example shows how to use the isolatedstoragefile class to store files and folders.

In the example, enter a file in the text box, click Save, and then read and display the saved text. First, we provide our front-endMainpage. XAMLOfCode:

 

1 <! -- Contentpanel-place other content here -->
 2 <Grid X: Name = "  Contentpanel  " Grid. Row = "  1  " Margin = "  12, 0, 12, 0  " >
 3 <Stackpanel>
 4 <Grid margin = "  0 15  " Height = "  300  " >
 5 <Textbox width = "  450  " Height = "  72  " Verticalalignment = " Top  " Name = "  Txtwrite  " />
 6 <Button width = "  200  " Height = "  72  " Content = "  Save data  " Verticalalignment ="  Center  " Name = "  Btnsave  " Click = "  Btnsave_click  " />
 7 </GRID>
 8 <Grid Height = "  350  " Margin ="  0 15  " >
 9 <Textblock width = "  200  " Height = "  72  " Verticalalignment = "  Top  " Horizontalalignment = "  Center " Fontsize = "  32  " Name = "  Txtread  " />
 10 <Button width = "  200  " Height = "  72  " Content = " Read data  " Verticalalignment = "  Center  " Name = "  Btnread  " Click = "  Btnread_click  " />
 11 </GRID>
 12 </Stackpanel>
13 </GRID>

 

ThenMainpage. XAML. CSBackground processing program:

 1  ///   <Summary>  
  2  ///  Write text in the text box to the file
  3  ///   </Summary> 
  4  ///   <Param name = "sender"> </param>  
  5  ///   <Param name = "E"> </param>  
  6           Private   Void Btnsave_click ( Object Sender, routedeventargs E)
 7 {
 8               //  Obtain the virtual storage of an application  
  9 Isolatedstoragefile mystore = isolatedstoragefile. getuserstoreforapplication ();
 10  
 11               //  Create a new folder in independent storage  
  12 Mystore. createdirectory ( "  Testfolder  " );
 13  
 14               //  Specify the file path and options  
  15               Using ( VaR Isofilestream = New Isolatedstoragefilestream ( @"  Testfolder \ mytestfile.txt  " , Filemode. openorcreate, mystore ))
 16 {
17                   //  Write Data  
  18                   Using ( VaR Isofilewriter = New Streamwriter (isofilestream ))
 19 {
 20 Isofilewriter. writeline (txtwrite. Text );
 21 }
 22 }
23 }
 24  
 25           ///   <Summary>  
  26    ///  Read written files
  27  ///   </Summary>  
  28  ///  <Param name = "sender"> </param>  
  29  ///   <Param name = "E"> </param>  
  30           Private   Void Btnread_click ( Object Sender, routedeventargs E)
 31 {
 32               //  Obtain the virtual storage of an application 
  33 Isolatedstoragefile mystore = isolatedstoragefile. getuserstoreforapplication ();
 34               Try 
 35 {
 36                   //  Reads a specified file from a specified directory.  
  37                   Using ( VaR Isofilestream = New Isolatedstoragefilestream (@"  Testfolder \ mytestfile.txt  " , Filemode. Open, mystore ))
 38 {
 39                       //  Read data  
  40                       Using ( VaR Isofilereader = New Streamreader (isofilestream ))
 41 {
42 Txtread. Text = isofilereader. Readline ();
 43 }
 44 }
 45 }
 46               Catch 
 47 {
 48                   //  Exception Handling  
  49 Txtread. Text = "  Please create files and folders in advance  " ;
 50 }
 51 }

Compile and run the program:

We can see that a folder and TXT file have been created successfully, and data is written into the TXT file. But do we actually create a file like this in the mobile phone storage activation? Microsoft's storage control in Windows Phone is very strict. We cannot directly view the files we created in the independent storage, but we canUse: The independent storage resource manager can list, copy, and replace files and directories in the independent storage.Next, we will copy the file we created to our computer.

 

2.use the independent storage resource manager (isw.l.exe) to copy the files created in the independent storage to the computer

Depending on the operating system, the installation location of the independent storage resource manager is as follows:

• Program Files \ microsoft sdks \ Windows Phone \ v7.1 \ tools \ isolatedstoragepolicertool

• Program Files (x86) \ microsoft sdks \ Windows Phone \ v7.1 \ tools \ isolatedstoragepolicertool

First, weOpen the simulator and make sure that our previous application has been deployed in the simulator and the file has been created in the standalone storage.Then, open the command line and enter the installation directory of the independent storage resource manager. For example, on my computer:

 

Then obtainProduct guidBecause we need to use it in the following commandThe wpappmanifest. xml file in the properties folderAppElementProductidAttribute Value, Select copy.Then, enter:

The productid attribute value of the isetool.exe ts XD application "path on the computer"

Here I am doing this:

 

Press enter, and the command is successful as follows:

Open the directory we copied to and we can see thatSuccessfulCopy the created file from Windows Phone to the local device:

 

Download with a click: sample source code

References:

Http://msdn.microsoft.com/zh-cn/library/ff626519 (V = vs.92). aspx (important)

Http://msdn.microsoft.com/zh-cn/library/hh286408 (V = vs.92). aspx

Http://msdn.microsoft.com/zh-cn/library/ff769544 (V = vs.92). aspx (important)

Author: Sunny pig

Source: Http://www.cnblogs.com/IPrograming

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